import dayjs from 'dayjs'
// import parseTime, formatTime and set to filter
export { parseTime, formatTime } from '@/utils'
// import { formatTimestamp } from '@/utils/date'

/**
 * Show plural label if time is plural number
 * @param {number} time
 * @param {string} label
 * @return {string}
 */
function pluralize (time, label) {
  if (time === 1) {
    return time + label
  }
  return time + label + 's'
}

/**
 * @param {number} time
 */
export function timeAgo (time) {
  const between = Date.now() / 1000 - Number(time)
  if (between < 3600) {
    return pluralize(~~(between / 60), ' minute')
  } else if (between < 86400) {
    return pluralize(~~(between / 3600), ' hour')
  } else {
    return pluralize(~~(between / 86400), ' day')
  }
}

/**
 * Number formatting
 * like 10000 => 10k
 * @param {number} num
 * @param {number} digits
 */
export function numberFormatter (num, digits) {
  const si = [
    { value: 1E18, symbol: 'E' },
    { value: 1E15, symbol: 'P' },
    { value: 1E12, symbol: 'T' },
    { value: 1E9, symbol: 'G' },
    { value: 1E6, symbol: 'M' },
    { value: 1E3, symbol: 'k' }
  ]
  for (let i = 0; i < si.length; i++) {
    if (num >= si[i].value) {
      return (num / si[i].value).toFixed(digits).replace(/\.0+$|(\.[0-9]*[1-9])0+$/, '$1') + si[i].symbol
    }
  }
  return num.toString()
}

/**
 * 10000 => "10,000"
 * @param {number} num
 */
export function toThousandFilter (num) {
  return (+num || 0).toString().replace(/^-?\d+/g, m => m.replace(/(?=(?!\b)(\d{3})+$)/g, ','))
}

/**
 * Upper case first char
 * @param {String} string
 */
export function uppercaseFirst (string) {
  return string.charAt(0).toUpperCase() + string.slice(1)
}

// 转为百分号，保留小数点
export function toPercent (num, total) {
  console.log((parseFloat(num), parseFloat(total)))
  return Math.round(((parseFloat(num) / parseFloat(total) || 0)) * 10000) / 100.0 + '%' // 小数点后两位百分比
}

/**
 * Upper case first char
 * @param {String} string
 */
export function dateFilter (string, type = 'YYYY/MM/DD HH:mm:ss') {
  if (!string) {
    return ''
  }
  return dayjs(string).format(type)
}

/**
 * 用出生日期计算月龄
 * @param {String} string
 */
export function monthFilter (val) {
  if (!val) {
    return '--'
  }
  return dayjs().diff(dayjs(val).format('YYYY/MM/DD'), 'month')
}
